Cold storage operation and maintenance experience sharing

Preparation before starting

Before starting up, check whether the valves of the unit are in normal starting state, check whether the cooling water source is sufficient, and set the temperature according to the requirements after turning on the power. The refrigeration system of the cold storage is generally automatically controlled, but the cooling water pump should be turned on when it is used for the first time, and the compressors should be started one by one after normal operation.

Operation Management

Pay attention to the following points after the normal operation of the refrigeration system:

        1. Listen to whether there is any abnormal sound during the operation of the equipment;

        2. Check whether the temperature in the warehouse drops;

        3. Check whether the hot and cold of the exhaust and suction are distinct, and whether the cooling effect of the condenser is normal.

Ventilation and defrost

Fruits and vegetables will release some gas during storage, and accumulation to a certain extent will cause physiological disorders of the collection, deterioration of quality and taste. Therefore, frequent ventilation is required during use, and generally should be done in the morning when the temperature is lower. In addition, the evaporator will form a layer of frost after the cold storage is used for a period of time. If it is not removed in time, it will affect the cooling effect. When defrosting, cover the storage in the storage and use a broom to clean the frost. Be careful not to hit hard.

1. For the evaporator of the air-cooled machine: always check the defrosting situation and whether the defrosting is effective in time, which will affect the refrigeration effect and cause liquid back in the refrigeration system.
2. Frequently observe the compressor’s operating status and check its exhaust temperature. During seasonal operation, pay special attention to the system’s operating status, and adjust the system’s liquid supply and condensing temperature in time.
3. Operating the unit: Always observe the oil level and return of the compressor and the cleanliness of the oil. If the oil is dirty or the oil level drops, solve it in time to avoid poor lubrication.
4. Listen carefully to the operating sound of the compressor, cooling tower, water pump or condenser fan, and deal with any abnormalities in time. At the same time, check the vibration of the compressor, exhaust pipe and foot.
5. Maintenance of the compressor: The internal cleanliness of the system is poor at the initial stage. The refrigerating oil and filter drier should be replaced after 30 days of operation, and then replaced again after half a year of operation (depending on the actual situation). For systems with higher cleanliness, the refrigerating oil and filter drier must be replaced once after half a year of operation, depending on the situation in the future.
6. Operating the unit: Always observe the oil level and return of the compressor and the cleanliness of the oil. If the oil is dirty or the oil level drops, solve it in time to avoid poor lubrication.
7. For air-cooled units: clean the air cooler frequently to keep it in a good heat exchange state. For water-cooled units: Check the turbidity of the cooling water frequently. If the cooling water is too dirty, replace it. Check the water supply system for bubbles, drips, drips and leaks. Whether the water pump is working normally, whether the valve switch is effective, and whether the cooling tower fan is normal.

         8.For the evaporator of the air-cooled machine: always check the defrosting situation, whether the defrosting is effective in time, will affect the refrigeration effect, and cause liquid back in the             refrigeration system.
        9.Frequently observe the operating status of the compressor: check its discharge temperature, and pay special attention to the operating status of the system during seasonal operation, and adjust          the system’s liquid supply and condensing  temperature in time.
       10.Listen carefully to the operating sound of the compressor, cooling tower, water pump or condenser fan, and deal with any abnormalities in time. At the same time, check the vibration of the             compressor, exhaust pipe and foot.
       11.Maintenance of the compressor: The internal cleanliness of the system is poor at the initial stage. The refrigerating oil and filter drier should be replaced after 30 days of operation, and then              replaced again after half a year of operation (depending on the actual situation). For systems with higher cleanliness, the refrigerating oil and filter drier must be replaced once after half a year            of  operation, depending on the situation in the future.